What is the location of my Linux headers?

[Dave M G]

Ubuntu Users,
	When running the command "sudo dpkg-reconfigure wacom-kernel-source",
I'm presented with the following question:

You have choosen to compile the wacom modules, so you must specify the
location of the Linux kernel headers for them to use. 
When Linux headers are provided by a kernel-headers-* package, they
reside in /usr/src/kernel-headers-*. 
What is the location of your Linux headers?  

	I thought these "headers" weould be in /usr/src/linux-source-2.6.12,
but it says it can't find them there.

	Where are they?

	And if anyone is wondering, I'm doing this because I'm trying,
desperately, to get my Wacom tablet working. It's stuck in "absolute"
mode, which sucks completely.

--
Dave M G